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" The parable teaches us the nature of that union. The connection between the vine and the branch is a living one. No external, temporary union will suffice; no work of man can effect it: the branch, whether an original or an engrafted one, is such only by the Creator's own work, in virtue of which the life, the sap, the fatness, and the fruitfulness of the vine communicate themselves to the branch. And just so it is with the believer too. His union with his Lord is no work of human wisdom or human will, but an act of God, by which the closest and most complete life-union is effected between the Son of God and the sinner. "God hath sent forth the Spirit of His Son into your hearts." The same Spirit which dwelt and still dwells in the Son, becomes the life of the believer; in the unity of that one Spirit, and the fellowship of the same life which is in Christ, he is one with Him. As between the vine and branch, it is a life-union that makes them one. "
― Andrew Murray , Abide in Christ: The Joy of Being in God's Presence
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" Oh! my Lord Jesus, though I do not understand it, though I cannot grasp it, though my struggles avail nothing, I am not going to let Thee go. If it is possible for a sinner on earth to have Jesus every day, every hour, and every moment in resurrection power dwelling in his heart, shining within him, filling him with love and joy,—if that is possible, I want it. "
― Andrew Murray , Jesus Himself